There are no dependencies for the _codec_* and _multibytecodec modules, so if you're hacking away on a header file in Modules/cjkcodecs/ and execute make, you're not going to get a correct rebuild of those extension modules.

Linked PRs

• gh-103527: Add make deps for _codecs_* and _multibytecodec #103528
• gh-103527: Add multibytecodec.h as make dep for _codecs_* #103567